On-Line Modal State Monitoring of Slowly Time-Varying Structures
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On-Line Modal State Monitoring of Slowly Time-Varying Structures
- Publication date
- 1997-10-01
- Usage
- Public Domain
- Topics
- TURBINE ENGINES, TURBINES, TURBOSHAFTS, GAS PRESSURE, GAS GENERATORS, FUEL FLOW, DIAGNOSIS, ESTIMATING, FAULT DETECTION
- Collection
- nasa_techdocs
- Contributor
- NASA
- Language
- English
- Rights
- Public Domain
Monitoring the dynamic response of structures is often performed for a variety of reasons. These reasons include condition-based maintenance, health monitoring, performance improvements, and control. In many cases the data analysis that is performed is part of a repetitive decision-making process, and in these cases the development of effective on-line monitoring schemes help to speed the decision-making process and reduce the risk of erroneous decisions. This report investigates the use of spatial modal filters for tracking the dynamics of slowly time-varying linear structures. The report includes an overview of modal filter theory followed by an overview of several structural system identification methods. Included in this discussion and comparison are H-infinity, eigensystem realization, and several time-domain least squares approaches. Finally, a two-stage adaptive on-line monitoring scheme is developed and evaluated.
- Accession-id
- 97N31006
- Addeddate
- 2011-05-23 11:08:16
- Document-source
- CASI
- Documentid
- 19970037562
- Identifier
- nasa_techdoc_19970037562
- Identifier-ark
- ark:/13960/t2k65bz7n
- Nasa-center
- Ames Research Center; Dryden Flight Research Center
- Ocr
- ABBYY FineReader 8.0
- Online-source
- http://wayback.archive-it.org/1792/20100214184555/http://hdl.handle.net/2060/19970037562
- Original-nasa-rights
- Unclassified; No Copyright; Unlimited; Publicly available;
- Ppi
- 300
- Report-number
- NAS 1.15:111814; NASA-TM-111814
- Updated-added-to-ntrs
- 2005-10-13
- Year
- 1997
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